Terephthalic acid composition and process for the production thereof

a technology of terephthalic acid and composition, applied in the field of terephthalic acid, can solve the problems of not only removing impurities, but also reducing the amount of acetic acid and bromine compounds, reducing the level of color bodies and metals, and reducing or eliminating the resultant impurities. , to achieve the effect of reducing or eliminating the resultant impurities, and efficient and effective production o

Inactive Publication Date: 2008-06-10
BP CORP NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The inventive process efficiently and effectively produces terephthalic acid with purity comparable to conventional PTA purified by hydrogenation of crude product from paraxylene oxidation, while reducing or eliminating the resultant impurities, color bodies and carbon oxides produced in commercial practice by the liquid-phase oxidation of methyl-substituted benzene feedstocks.

Problems solved by technology

However, its substantial water content, high temperature and pressure and corrosive nature due to components such as gaseous methyl bromide, acetic acid solvent and water pose technical and economic challenges to separating or recovering components for recycle and recovering its energy content.
Purification not only removes impurities from the crude and medium purity products, particularly the major impurity, 4-carboxybenzaldehyde, but also reduces the level of color bodies and the amount of metals, acetic acid and bromine compounds.
Reducing or eliminating the production of impurities, color bodies and carbon oxides from such commercial processes continues to be an ongoing challenge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041]5 grams of FDCA (available from the Atlantic Chemical Company) and 100 grams of distilled and deionized (D&D) water were combined in an autoclave and then pressurized with ethylene and heated for 120 minutes. After the reaction time elapsed, the unit was cooled and depressurized, and the reaction mixture (i.e., a mixture of solids covered by the reaction solvent, which is known as the “mother liquor”) was collected. This mixture was then separated by filtration to yield a filtered cake (i.e., solids) and the mother liquor. Both the filtered cake and mother liquor were analyzed by high pressure liquid chromatography (HPLC).

[0042]As shown below in Table 1, as the reaction conditions were made more severe by increasing the temperature and pressure, not only was TA produced in one step, i.e., in a single reactor vessel, but its yield was also increased. Under the mild conditions of Example No. 1A, where 100 psig ethylene was used at a temperature of 100° C., no TA was observed by ...

example 2

[0045]100 grams of FDCA, 800 grams of methanol, 9.41 grams of phosphoric acid (85%), and 1.26 grams of water were charged into a high pressure reactor equipped with a gas inlet and outlet. The reactor was sealed, filled and flushed with nitrogen nine times. The inlet and outlet were then closed and the reaction mixture was stirred and heated to 200° C. for nine hours. The reactor was cooled, vented, and 878.95 grams of the total reactor content were collected. A gas-chromatographic analysis was conducted on the solids to reveal the following gas chromatographic peak area percentages: 63% DM FDCA, 21% monomethyl FDCA, and 14.9% unreacted FDCA. There were 1.1% unknowns estimated to be present.

[0046]The DM FDCA was separated from the other components by filtration of the solids. The solids were washed twice with fresh methanol and then dried at 60° C. under a slight vacuum at 27 mmHg to produce about 44.813 grams of solids. This material was then analyzed by gas chromatography—mass spe...

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Abstract

Terephthalic acid is prepared by reacting a 2,5-furandicarboxylate with ethylene in the presence of a solvent to produce a bicyclic ether; and then dehydrating the bicyclic ether. The process of the present invention effectively produces terephthalic acid, while reducing or eliminating the impurities, color bodies and carbon oxides produced in commercial practice by the liquid-phase oxidation of methyl-substituted benzene feedstocks.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to terephthalic acid and, more particularly, to a new terephthalic acid composition and a process for the production of terephthalic acid from a 2,5-furandicarboxylate.BACKGROUND OF THE INVENTION[0002]Terephthalic acid and other aromatic carboxylic acids are widely used in the manufacture of polyesters, commonly by reaction with ethylene glycol, higher alkylene glycols or combinations thereof, for conversion to fiber, film, containers, bottles and other packaging materials, and molded articles.[0003]In commercial practice, aromatic carboxylic acids are commonly made by liquid-phase oxidation in an aqueous acetic acid solvent of methyl-substituted benzene and naphthalene feedstocks, in which the positions of the methyl substituents correspond to the positions of carboxyl groups in the desired aromatic carboxylic acid product, with air or another source of oxygen, which is normally gaseous, in the presence of a bromine-promo...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C07C63/00
CPCC07C51/377C07D307/68C07C63/26
Inventor GONG, WILLIAM H.
Owner BP CORP NORTH AMERICA INC
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